安装自己编写的动态库，出现错误：

CMake Error at lib/cmake_install.cmake:48 (file):
  file INSTALL cannot copy file
  "/home/aal/cmake/t3/build/lib/libhello.so.1.1" to
  "/usr/lib/libhello.so.1.1".
Call Stack (most recent call first):
  cmake_install.cmake:37 (include)

make: *** [install] 错误 1

解决办法：安装共享库，有时需要root密码。此时用 sudo make install.

CMake：消灭error（二）